Thanks for that Link Andrew. I doesn't actually discuss the fact that there is such a thing as Half Duplex or Full duplex connections, but it does give us a good look at the technology.
However the point that Simon tried to get across, is that there is in fact a feature of ADSL connections that I tried to highlight. Easy to prove by the way. This is a little difficult to do in isolation, but it obviously proves the point. Again, I will take your point here that there could be many factors that will effect the download rate !!! But this will be obvious. Step 1) GO to a site, and download a large file. Wait for that to finish. Document the download rate. Step 2) Now find an FTP site and upload a large file or Send a large email that will effectively tie up your Upload capacity on your link. Step 3) While that upload is in happening, try and download a different file from the same site that you used in step 1. To ensure it isn't coming from any cache or the like. Let me know if the download rate is the same or close to the same that you wrote down in step 1. I'm going to assume that your train of thought was that all ADSL connections are full duplex, and I can only base that on your response to my posting. If that is the case, you should not have a big difference in the download rate from Step 1 to Step 3. Experience tells me that if you have a vanilla ADSL or SDSL connection, your download performance will be significantly worse in step 3. Examples of different Connections: Westnet 512/512 SDSL = $79 / month (forget about the options) Westnet 512/512 SHDSL = $309 / Month Can you explain the difference in these plans Andrew ? In reality, the second plan will enable upload and download at the same speed at the same time. I forgive you mate.....maybe you did have a bad hair day. Regards Barry Lollo FUD Spreader - Apparently !!! -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Sent: Wednesday, 20 June 2007 8:32 PM To: 'General Practice Computing Group Talk' Subject: RE: [GPCG_TALK] virtual servers Look here; http://www.dslforum.org/aboutdsl/adsl_tutorial.html -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Simon James Sent: Wednesday, 20 June 2007 4:32 PM To: GPCG Talk Subject: Re: [GPCG_TALK] virtual servers Hi Andrew, Are you suggesting that an ADSL connection can function at peak performance in both the up and down directions simultaneously? As with dial-up modem connections, I don't think this is the case (and I think that was all Barry was trying to say). Cheers, Simon > What on earth are you talking about ??? > > Half duplex DSL ???? > > 'What the' as Rove would say ??? > > Do you have a reference to a web site explaining half duplex dsl connections > or is that a google april fools joke :) > > Talk about spreading FUD > > Andrew.C > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Barry Lollo > Sent: Monday, 18 June 2007 6:12 PM > To: General Practice Computing Group Talk > Subject: RE: [GPCG_TALK] virtual servers > > Duncan, > > David is right, A symmetrical DSL connection may improve performance, > however they are still typically a "Half Duplex" connection. That means > data can only travel in one direction at any one point in time. Another > option if the link is the issue, is a "Full Duplex" link. ISP's call > this different things, but essentailly you will pay a premium for this. > Now if there is a lot of traffic outbound, as well as inbound, there > will be data flowing in both directions at the same time, improving link > performance. Again......if the link is the issue. > > Regards > Barry Lollo > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of David Guest > Sent: Monday, 18 June 2007 7:37 AM > To: General Practice Computing Group Talk > Subject: Re: [GPCG_TALK] virtual servers > > Duncan Guy wrote: >> it is slower currently at TS remote sites, > Maximise your upload speed, probably with symmetrical DSL, assuming your > clients have adequate download speed. > >> but still sluggish at primary site, and the TS server has high >> resource usage, > App problem or TS problem? > > If all else fails throw another server at it. :-) > > David > > > _______________________________________________ > Gpcg_talk mailing list > [email protected] > http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk > _______________________________________________ > Gpcg_talk mailing list > [email protected] > http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk > > _______________________________________________ > Gpcg_talk mailing list > [email protected] > http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk _______________________________________________ Gpcg_talk mailing list [email protected] http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk _______________________________________________ Gpcg_talk mailing list [email protected] http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk _______________________________________________ Gpcg_talk mailing list [email protected] http://ozdocit.org/cgi-bin/mailman/listinfo/gpcg_talk
